/usr/lib/python3/dist-packages/matplotlib/_pylab_helpers.py is in python3-matplotlib 1.5.1-1ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | """
Manage figures for pyplot interface.
"""
from __future__ import (absolute_import, division, print_function,
unicode_literals)
from matplotlib.externals import six
import sys
import gc
import atexit
def error_msg(msg):
print(msg, file=sys.stderr)
class Gcf(object):
"""
Singleton to manage a set of integer-numbered figures.
This class is never instantiated; it consists of two class
attributes (a list and a dictionary), and a set of static
methods that operate on those attributes, accessing them
directly as class attributes.
Attributes:
*figs*:
dictionary of the form {*num*: *manager*, ...}
*_activeQue*:
list of *managers*, with active one at the end
"""
_activeQue = []
figs = {}
@classmethod
def get_fig_manager(cls, num):
"""
If figure manager *num* exists, make it the active
figure and return the manager; otherwise return *None*.
"""
manager = cls.figs.get(num, None)
if manager is not None:
cls.set_active(manager)
return manager
@classmethod
def destroy(cls, num):
"""
Try to remove all traces of figure *num*.
In the interactive backends, this is bound to the
window "destroy" and "delete" events.
"""
if not cls.has_fignum(num):
return
manager = cls.figs[num]
manager.canvas.mpl_disconnect(manager._cidgcf)
# There must be a good reason for the following careful
# rebuilding of the activeQue; what is it?
oldQue = cls._activeQue[:]
cls._activeQue = []
for f in oldQue:
if f != manager:
cls._activeQue.append(f)
del cls.figs[num]
manager.destroy()
gc.collect(1)
@classmethod
def destroy_fig(cls, fig):
"*fig* is a Figure instance"
num = None
for manager in six.itervalues(cls.figs):
if manager.canvas.figure == fig:
num = manager.num
break
if num is not None:
cls.destroy(num)
@classmethod
def destroy_all(cls):
# this is need to ensure that gc is available in corner cases
# where modules are being torn down after install with easy_install
import gc # noqa
for manager in list(cls.figs.values()):
manager.canvas.mpl_disconnect(manager._cidgcf)
manager.destroy()
cls._activeQue = []
cls.figs.clear()
gc.collect(1)
@classmethod
def has_fignum(cls, num):
"""
Return *True* if figure *num* exists.
"""
return num in cls.figs
@classmethod
def get_all_fig_managers(cls):
"""
Return a list of figure managers.
"""
return list(cls.figs.values())
@classmethod
def get_num_fig_managers(cls):
"""
Return the number of figures being managed.
"""
return len(cls.figs)
@classmethod
def get_active(cls):
"""
Return the manager of the active figure, or *None*.
"""
if len(cls._activeQue) == 0:
return None
else:
return cls._activeQue[-1]
@classmethod
def set_active(cls, manager):
"""
Make the figure corresponding to *manager* the active one.
"""
oldQue = cls._activeQue[:]
cls._activeQue = []
for m in oldQue:
if m != manager:
cls._activeQue.append(m)
cls._activeQue.append(manager)
cls.figs[manager.num] = manager
@classmethod
def draw_all(cls, force=False):
"""
Redraw all figures registered with the pyplot
state machine.
"""
for f_mgr in cls.get_all_fig_managers():
if force or f_mgr.canvas.figure.stale:
f_mgr.canvas.draw_idle()
atexit.register(Gcf.destroy_all)
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